If you can see clean shiny melt at the top of a 25 lb Castmaster, at just about ANY time during the complete consumption of the contents of your days, or casting session's run,,,,,,you're not doing it right, and you WILL loose your ratio balance in the process.

You can ADD flux, during your casting session,......WITHOUT disturbing the existing, nasty looking mess on top of your pot,......

alla' this while maintaining what I started calling a "Coefficient of thermal equilibrium",......moons ago.

GTC

Member, Clan of the Border Rats
-- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain